Can you add additional elements to XHTML 1.0 page?

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I'm assuming there's a way to do the following, but I'm having trouble
finding good information on it.  If someone could point me to a good
webpage on it...

I want to take a Valid XHTML 1.0 page and add some elements to it.

Example: Let's say I want to add the elements "DATE" and "TEXT" to an
XHTML page as in the following:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    " ">
<html xmlns=" " xml:lang="en" lang="en">
            <td><TEXT>Test Text 1</TEXT></td>
            <td><TEXT>Test Text 2</TEXT></td>

How would I do this?  Is there a way to do it where it could still
validate as XHTML 1.0 Strict?

I tried adding [<!ELEMENT DATE (CDATA)> <!ELEMENT TEXT (CDATA)>] to the
DOCTYPE tag, but it created two problems:

1) It would at ]> at the top of my webpage.
2) I got errors when validating saying I couldn't add those elements in
those places (i.e. within <td> tags).

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